Why You Need a Homebuyer Drain Survey
Drains are rarely covered by a standard house survey — yet a damaged drain can cost thousands. Here's why a homebuyer drain survey is worth it before you exchange.
You’re buying a house. You’ve booked a building survey, your solicitor is doing their searches — and the drains are almost certainly not being checked. That’s a problem, because a collapsed or root-damaged drain is one of the few defects that can cost thousands to put right and isn’t always obvious until it fails.
A homebuyer drain survey closes that gap.
Why standard surveys miss the drains
Most building surveys explicitly exclude below-ground drainage. The surveyor can comment on what they can see above ground, but they won’t send a camera down the drains. So the condition of the private drainage — the bit you become responsible for as the owner — typically goes unchecked.
What a homebuyer drain survey covers
A full CCTV drain survey covers the private drain runs and connections, recording:
- Cracks, fractures and displaced joints
- Root ingress (a very common issue in older, tree-lined streets)
- Signs of a partial or full collapse
- Whether connections are correct and where they run — see drain mapping & tracing
- Where the rainwater goes, for example to a sewer or to a soakaway
Ask for footage and a clear, buyer-focused report you can share with your solicitor.
Why it’s worth it before you exchange
Timing matters. Book the survey before exchange of contracts (in Scotland, before the missives are concluded), while you still have room to act on what it finds. If there’s a problem, you can:
- Renegotiate the price to reflect the cost of repair
- Ask the seller to fix it before completion
- Walk away if the problem is serious enough
Find a defect after completion and it’s simply yours to pay for. If the survey does find a collapse, you can still go ahead with buying a house with a collapsed drain, but settle the repair first.
It’s not just old houses
Period homes often have original clay drains and shared runs, which suit roots and joint failures. The city pages cover period housing in London, Victorian terraces in Bristol, tenements and Georgian terraces in Edinburgh and older terraces in Liverpool. Some cities also have a page for homebuyer drain surveys in Manchester and similar, and the list of cities covered shows them all. Newer homes aren’t immune, though. Poor installation, ground movement and wrong connections all show up on camera.
How much does it cost?
Far less than a drain repair. The guide to CCTV drain survey costs sets out the figures, and a homebuyer survey is a small fee against a purchase worth hundreds of thousands. If you are still deciding, read whether you need a drain survey when buying.
Book before you commit
If you’re buying, get the drains checked while you still have leverage. Send us the property’s postcode and we’ll pass your request on straight away. Ask for a report your solicitor can use.